[Bldg-sim] MRT Tool

[Timothy Moore]

My apologies... I've just learned that I in fact have a more advanced version of the ASHRAE Standard-55 Comfort Model than has yet been approved and published by ASHRAE, and the current published version does not include the MRT calculation tool.

 

ASHRAE is due to provide an updated version of the tool in the near future, but the timing of that is presently unknown.

 

 

The current release of the IES Virtual Environment does, however, provide air temp, individual surface temperatures, MRT, dry resultant temp, DPT, moisture content, and RH for all simulation reporting intervals. These results from the dynamic thermal model, plus user inputs for occupant clothing level, activity level, and local air speed then provide occupant PPD, PMV, and Comfort Index for each simulation reporting interval. To assess comfort in close proximity to a glazed façade vs. the middle of a larger space, users can sub-divide the space to create a smaller thermal zone adjacent to the façade in question. 

 

Additional consideration are required to model the effects of transmitted short-wave radiation actually striking an occupant (see my prior post on this thread regarding asymmetrical thermal comfort involving transmitted short-wave radiation).

 

 

 


Timothy Moore 
Senior Consultant
Special Projects 

Mobile: 415 810 2495 
Office: 415 983-0603
timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 

**Design, Simulate + Innovate with the <Virtual Environment>**

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Timothy Moore
Sent: Tuesday, April 21, 2009 7:45 PM
To: Peter Simmonds; Karen Walkerman; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] MRT Tool

 

The ASHRAE Standard-55 Comfort Model (proper name) does allow for a single user input. However, immediately to the right of the MRT value, it also includes a "Calc" button that opens a separate dialog. In this separate dialog, the user can enter values for the following parameters:

 

Room dimensions

Occupant location

Occupant orientation (facing wall or azimuth)

Occupant position (seated or standing)

Temperature for each of four walls, ceiling, and floor

And dimensions, location, and temperature for a "window or panel" area within each of the four walls, ceiling, and floor.

 

I just sent a post with the actual MRT calculation dialog box (for those of you that receive visuals in your emails); however, it appears that the screen shot of the dialog was too big for the Bldg-Sim list serve.

 

The IES Virtual Environment also provides MRT, dry resultant temperature, and the full range of ASHRAE 55 thermal comfort input parameters and results (PPD, PMV, etc.) for a location in the center of the room, as well as surface temperature results for each individual surface in the model. These surface temperatures, for any given simulation time step, can then be readily entered into the ASHRAE Standard-55 Comfort Model above if one is interested in thermal comfort for a specific location within a rectangular room. 

 

 


Timothy Moore 
Senior Consultant
Special Projects 

Mobile: 415 810 2495 
Office: 415 983-0603
timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 

**Design, Simulate + Innovate with the <Virtual Environment>**

Email Disclaimer <http://www.iesve.com/disclaimer.html> 

 

 

 

 

 

 

 

 

From: Peter Simmonds [mailto:peter.simmonds at ibece.net] 
Sent: Tuesday, April 21, 2009 10:36 AM
To: Timothy Moore; Karen Walkerman; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] MRT Tool

 

I do not think the thermal comfort tool calculates the MRT it is a user input.

 

Peter Simmonds. Ph.D.
Senior Associate, Advanced Technology Group

IBE Consulting Engineers
14130 Riverside Drive Suite 201
Sherman Oaks, CA 91423
p:   (818) 377-8220 ext. 246
f:    (818) 377-8230
m:  (818) 219-1284

This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure, or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message

 

________________________________

From: Timothy Moore [mailto:timothy.moore at iesve.com] 
Sent: Tuesday, April 21, 2009 10:00 AM
To: Karen Walkerman; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] MRT Tool

 

Karen,

 

The ASHRAE-55 Thermal Comfort Tool created by the UC Berkeley Center for the Built Environment and available from ASHRAE publications (if I recall correctly) includes a very easy-to-use MRT calculator for rectangular rooms. It allows for MRT at a particular position in that room, separate surface temperatures and dimensions for surfaces, and also the inclusion of a "panel" or other area within one of the walls (such as a cold/hot window, heating panel, etc.) that has a distinct temperature. This is part of a very handy tool for determining PPD, etc. based upon the typical range of human thermal comfort variables (clo value, activity level, air temp, MRT, humidity, air movement).

 

Cheers,

Timothy

 

 




Timothy Moore 
Senior Consultant
Special Projects 

Mobile: 415 810 2495 
Office: 415 983-0603
timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 

**Design, Simulate + Innovate with the <Virtual Environment>**

Email Disclaimer <http://www.iesve.com/disclaimer.html> 

 

 

 

 

 

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Karen Walkerman
Sent: Tuesday, April 21, 2009 9:50 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] MRT Tool

 

Hello,

Is anyone aware of a simple Mean Radiant Temperature calculation tool?  I'm looking for something that will calculate MRT for a basic rectangular room.

Thanks!

--
Karen

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